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The National Aviation Operational Monitoring Service (NAOMS) was a research project designed to develop a methodology for acquiring information on changes over time in safety-related events occurring in the National Airspace System. A scientifically designed survey was used to measure the experiences of front-line operators and to evaluate trends that could compromise safety. Information from NAOMS could be the first indication of a developing situation, providing the basis for further investigation using other sources. This paper reports on a demonstration of the NAOMS concept through development and conduct of a survey of air carrier pilots. Data from over 18,000 randomly selected pilots were taken over a three-year period. Results of this demonstration provide evidence that the NAOMS survey methodology can reliably identify changes over time in the rates of occurrence of safety-related events.